ミドルエイジ

noun, noun which may take the genitive case particle 'no'

middle age

Refers to the period of life between young adulthood and old age, typically around 40–60. Used as a noun or with の to modify another noun.

• 彼かれはミドルエイジになってから健けん康こうに気きをつけるようになった。

  He started paying attention to his health after reaching middle age.

• ミドルエイジの男だん性せいが増ふえている。

  The number of middle-aged men is increasing.